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(import (std text json)
(scheme case-lambda)
(scheme hash-table))
(begin
(define (json-object . pairs)
(alist->hash-table pairs eq?))
(define json-list list)
(define json-null (if #f #f))
(define (json-object? obj)
(or (hash-table? obj)
(json-record? obj)))
(define json-list? list?)
(define (json-null? obj)
(eq? obj json-null))
(define (json-object-contains-key? json key)
(or (and (hash-table? json)
(hash-table-contains? json key))
(and (json-record? json)
(json-object-contains-key? (json-record->fields json) key))))
(define string->json string->json-object)
(define (json->string json)
(json-object->string (json->typeless-json json)))
(define (json-object-ref json key)
(cond
((hash-table? json)
(if (json-object-contains-key? json key)
(hash-table-ref json key)
((json-key-not-found))))
((json-record? json)
(json-object-ref (json-record->fields json) key))
(else ((json-key-not-found)))))
(define (json-object-set! json key value)
(cond
((and (hash-table? json)
(json-object-contains-key? json key))
(hash-table-set! json key value)
json)
((json-record? json)
(or (let ((pair (assoc key (json-record->mutators json))))
(if pair
(let ((mutator (cdr pair)))
(if mutator
(begin
(mutator json value)
json)
#f))
#f))
(error "json-object-set!: no mutator for field" (json-record->name json) key)))))
(define json-list-ref list-ref)
(define json-list-length length)
(define (json-object-map proc json)
(define res (json-object))
(hash-table-for-each
(lambda (key value)
(call-with-values (lambda () (proc key value))
(case-lambda
((key value) (hash-table-set! res key value))
(_ (error "json-object-map: proc did not return two values")))))
json)
res)
(define json-list-map map)
(define (json-object->alist obj)
(cond
((hash-table? obj)
(hash-table->alist obj))
((json-record? obj)
(json-object->alist (json->typeless-json obj)))
(else (error "json-object->alist: not an object" obj))))
(define json-list->list values))
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